MAX1259CPE データシートの表示（PDF） - Maxim Integrated
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MAX1259CPE Datasheet PDF : 8 Pages
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MAX1259
Battery Manager
Capacitance
(All grades, TA = +25°C, unless otherwise noted.) (Note 10)
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CIN
COUT
CONDITIONS
MIN TYP
5
5
AC Electrical Characteristics
(VCC = 4.0V to 5.5V, all grades, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
VCCI Fall Time
tF
300
VCCI Rise Time
tR
1
Power-Down to PF Low
tPF
0
PF High After Power-Up
tREC
RST Pulse Width
RSTPW
50
10
Note 1: All voltages referenced to ground.
Note 2: Trip-point voltage for power-fail detect: VTP = 1.26 x VBATT. For 5% operation: VBATT = 3.7V max.
Note 3: 50pF load capacity.
Note 4: Measured with pins 3, 11, 12, 13, and open.
Note 5: VTP is the point at which PF is driven low.
Note 6: VBATTF is the point at which BF is driven low.
Note 7: ICCO2 may be limited by battery capacity.
Note 8: Battery leakage is the internal energy consumed by the MAX1259.
Note 9: See the Typical Operating Characteristics BAT Switch Drop vs. Battery Voltage graph.
Note 10: Guaranteed by design. Not tested.
MAX
10
10
UNITS
pF
pF
MAX
100
UNITS
µs
µs
µs
µs
ns
Pin Description
PIN
1, 4, 9, 10, 14
2
NAME
N.C.
VBATT
3
BF
5
BAT
6
7, 8
11
12, 13
15, 16
RST
GND
PF
VCCO
VCCI
FUNCTION
No Connection. Make no connection to these pins.
Backup Battery Input
Battery-Fail Output. BF is high for VCCI at or above VTP and the backup battery greater than 2V. If the
backup battery is below 2V or VCCI falls below VTP, BF will be driven low.
Battery Output. During normal operation, the BAT output supplies up to 1mA of continuous battery
current. In shipping mode, the BAT output is high impedance.
Battery-Disconnect Input. The RST input is used to prevent battery discharge during shipping. Pulsing
the RST input disconnects the backup battery from the VCCO and BAT outputs.
Ground
Power-Fail Output. PF is high for VCCI greater than 1.26 x VBATT (VTP), indicating a valid VCCI voltage.
CMOS RAM is Powered from VCCO. The battery switchover circuit compares VCCI to the VBATT input,
and connects VCCO to whichever is higher.
+5V VCC Input
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